private void OnCustomGeneratorItemsChanged(object sender, CustomGeneratorChangedEventArgs e)
{
switch (e.Action)
{
//In case of a Reset, nothing to do since the Panel base class has cleared the internal children already!
case NotifyCollectionChangedAction.Reset:
if (this.InternalChildren.Count > 0)
{
this.RemoveInternalChildRange(0, this.InternalChildren.Count);
}
else
{
this.InvalidateMeasure();
}
break;
//If there was a removal (collapsing)
//or if there was a Move (edition of a Sorted field)
case NotifyCollectionChangedAction.Move:
case NotifyCollectionChangedAction.Remove:
//remove the concerned range
int index = e.OldPosition.Index;
if (e.OldPosition.Offset != 0)
{
index++;
}
this.RemoveInternalChildRange(index, e.ItemUICount);
break;
//if some items were added (expansion)
case NotifyCollectionChangedAction.Add:
//invalidate layout so that the items will be inserted in place!
this.InvalidateMeasure();
break;
case NotifyCollectionChangedAction.Replace:
Debug.Fail("NotifyCollectionChangedAction.Replace");
break;
default:
break;
}
}
private void HandleGeneratorItemsChanged(object sender, CustomGeneratorChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
{
this.OnItemsAdded(e.Position, e.Index, e.ItemCount);
break;
}
case NotifyCollectionChangedAction.Move:
{
this.OnItemsMoved(e.Position, e.Index, e.OldPosition, e.OldIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers);
break;
}
case NotifyCollectionChangedAction.Remove:
{
this.OnItemsRemoved(e.Position, e.Index, e.OldPosition, e.OldIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers);
break;
}
case NotifyCollectionChangedAction.Replace:
{
this.OnItemsReplaced(e.Position, e.Index, e.OldPosition, e.OldIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers);
break;
}
case NotifyCollectionChangedAction.Reset:
{
this.OnItemsReset();
break;
}
default:
{
throw new System.ComponentModel.InvalidEnumArgumentException("An unknown action was specified.");
}
}
}
